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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3aeeaadb30e6aa775bf03ec3134dda2492d26b8ebea21dc217f79e9e4f2c82f9' 
  AND token = '6F0UbrUF0FQuL9TS3SeClI+iQJ+uLweWDorEdXQdW24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}